多字节、UTF-8、Unicode之间的转换

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// 多字节编码转为UTF8编码 bool MBToUTF8(vector<char>& pu8, const char* pmb, int32 mLen) { // convert an MBCS string to widechar int32 nLen = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, NULL, 0); WCHAR* lpszW = NULL; try { lpszW = new WCHAR[nLen]; } catch(bad_alloc &memExp) { return false; } int32 nRtn = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, lpszW, nLen); if(nRtn != nLen) { delete[] lpszW; return false; } // convert an widechar string to utf8 int32 utf8Len = WideCharToMultiByte(CP_UTF8, 0, lpszW, nLen, NULL, 0, NULL, NULL); if (utf8Len <= 0) { return false; } pu8.resize(utf8Len); nRtn = WideCharToMultiByte(CP_UTF8, 0, lpszW, nLen, &*pu8.begin(), utf8Len, NULL, NULL); delete[] lpszW; if (nRtn != utf8Len) { pu8.clear(); return false; } return true; } // UTF8编码转为多字节编码 bool UTF8ToMB(vector<char>& pmb, const char* pu8, int32 utf8Len) { // convert an UTF8 string to widechar int32 nLen = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, NULL, 0); WCHAR* lpszW = NULL; try { lpszW = new WCHAR[nLen]; } catch(bad_alloc &memExp) { return false; } int32 nRtn = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, lpszW, nLen); if(nRtn != nLen) { delete[] lpszW; return false; } // convert an widechar string to Multibyte int32 MBLen = WideCharToMultiByte(CP_ACP, 0, lpszW, nLen, NULL, 0, NULL, NULL); if (MBLen <=0) { return false; } pmb.resize(MBLen); nRtn = WideCharToMultiByte(CP_ACP, 0, lpszW, nLen, &*pmb.begin(), MBLen, NULL, NULL); delete[] lpszW; if(nRtn != MBLen) { pmb.clear(); return false; } return true; } // 多字节编码转为Unicode编码 bool MBToUnicode(vector<wchar_t>& pun, const char* pmb, int32 mLen) { // convert an MBCS string to widechar int32 uLen = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, NULL, 0); if (uLen<=0) { return false; } pun.resize(uLen); int32 nRtn = MultiByteToWideChar(CP_ACP, 0, pmb, mLen, &*pun.begin(), uLen); if (nRtn != uLen) { pun.clear(); return false; } return true; } //Unicode编码转为多字节编码 bool UnicodeToMB(vector<char>& pmb, const wchar_t* pun, int32 uLen) { // convert an widechar string to Multibyte int32 MBLen = WideCharToMultiByte(CP_ACP, 0, pun, uLen, NULL, 0, NULL, NULL); if (MBLen <=0) { return false; } pmb.resize(MBLen); int nRtn = WideCharToMultiByte(CP_ACP, 0, pun, uLen, &*pmb.begin(), MBLen, NULL, NULL); if(nRtn != MBLen) { pmb.clear(); return false; } return true; } // UTF8编码转为Unicode bool UTF8ToUnicode(vector<wchar_t>& pun, const char* pu8, int32 utf8Len) { // convert an UTF8 string to widechar int32 nLen = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, NULL, 0); if (nLen <=0) { return false; } pun.resize(nLen); int32 nRtn = MultiByteToWideChar(CP_UTF8, 0, pu8, utf8Len, &*pun.begin(), nLen); if(nRtn != nLen) { pun.clear(); return false; } return true; } // Unicode编码转为UTF8 bool UnicodeToUTF8(vector<char>& pu8, const wchar_t* pun, int32 uLen) { // convert an widechar string to utf8 int32 utf8Len = WideCharToMultiByte(CP_UTF8, 0, pun, uLen, NULL, 0, NULL, NULL); if (utf8Len<=0) { return false; } pu8.resize(utf8Len); int32 nRtn = WideCharToMultiByte(CP_UTF8, 0, pun, uLen, &*pu8.begin(), utf8Len, NULL, NULL); if (nRtn != utf8Len) { pu8.clear(); return false; } return true; }

原文：http://blog.csdn.net/shellching/archive/2010/02/22/5316442.aspx